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التكامل بالكسور الجزئية: Mathematics Tawjihi question with answer

A Tawjihi Mathematics question (التكامل) with the answer and worked steps.

From the Tawjihi question bank: Mathematics · التكامل

أجد التكامل: 3x41x21dx\int \frac{3x^4 - 1}{x^2 - 1} dx.

التكامل بالكسور الجزئية

The answer

1. درجة البسط أكبر من درجة المقام، لذلك نبدأ بالقسمة: 3x41x21=3x2+3+2x21\frac{3x^4-1}{x^2-1}=3x^2+3+\frac{2}{x^2-1}. 2. نجزئ الباقي: 2x21=1x11x+1\frac{2}{x^2-1}=\frac{1}{x-1}-\frac{1}{x+1}. 3. يصبح التكامل (3x2+3+1x11x+1)dx\int\left(3x^2+3+\frac{1}{x-1}-\frac{1}{x+1}\right)dx. 4. الجواب x3+3x+lnx1lnx+1+Cx^3+3x+\ln|x-1|-\ln|x+1|+C.

Explanation

هذا هو مثال القسمة الطويلة في الصفحات 50-51: لا تبدأ بالكسور الجزئية قبل تجهيز الكسر.

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